"Good," she says. Then she pulls down the front of her panties to reveal her pussy to your hungry gaze.
"That's it," she urges you, "speed up your stroking! I want to make it really hard for you!"
Why? you plead with her.
"I have to know if you're a worthy panty-slave before I commit to being your mistress!" she says.
You speed up your stroking and apply more lube. You are quickly on the edge of orgasm and struggle to hold it back!